Gemstone



FIG. 1 is a top view of a gemstone showing a medium-table version of the first embodiment of my new design;

FIG. 2 is a top view of a gemstone, showing a medium-table version of the second embodiment of my new design; and,

FIG. 3 is a bottom view of the gemstone of either of the embodiments of the present invention. 

The ornamental design for a gemstone, as shown and described. 